Comments

If you use VLC media player you press on the tab Video -> Subtitle tracks -> Open File. And navigate to the folder where you have the subtitle. Mark it and press open. You should now have subtitle. To deactivate the subtitle press the tab Video -> Subtitle Tracks -> Disable.

If you mean when you play the movie on your DVD-player. You need to rename the subtitle track to the same name as the movie file and put it in the same folder.